/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hqd.ch03.v35.beans.converter.support;

import com.hqd.ch03.utils.ClassUtils;
import com.hqd.ch03.v35.beans.converter.ConversionService;
import com.hqd.ch03.v35.beans.converter.GenericConverter;
import com.hqd.ch03.v35.core.convert.TypeDescriptor;

/**
 * Internal utilities for the conversion package.
 *
 * @author Keith Donald
 * @author Stephane Nicoll
 * @since 3.0
 */
abstract class ConversionUtils {


    public static Object invokeConverter(GenericConverter converter, Object source,
                                         TypeDescriptor sourceType, TypeDescriptor targetType) {

        try {
            return converter.convert(source, sourceType, targetType);
        } catch (RuntimeException ex) {
            throw ex;
        } catch (Throwable ex) {
            throw new RuntimeException("the " + sourceType + "is not conver to " + targetType, ex);
        }
    }

    public static boolean canConvertElements(TypeDescriptor sourceElementType,
                                             TypeDescriptor targetElementType, ConversionService conversionService) {

        if (targetElementType == null) {
            // yes
            return true;
        }
        if (sourceElementType == null) {
            // maybe
            return true;
        }
        if (conversionService.canConvert(sourceElementType, targetElementType)) {
            // yes
            return true;
        }
        if (ClassUtils.isAssignable(sourceElementType.getType(), targetElementType.getType())) {
            // maybe
            return true;
        }
        // no
        return false;
    }

    public static Class<?> getEnumType(Class<?> targetType) {
        Class<?> enumType = targetType;
        while (enumType != null && !enumType.isEnum()) {
            enumType = enumType.getSuperclass();
        }
        return enumType;
    }

}
